Vapor-burning lamp.



Patented Sept. 4, |900.

lNu. 657,127.

w. MITCHELL.

VAPOR BURNING LAMP.

(Application led Apr. 5, 1899. Renewed July 20, 1900.)

No Model.)

mi mms Evans co', wonmuwn. wAsHmoTm n c Uisrrnn 'rafrEs PATENT CEEICE.

ASSIGNMENTS, TO THE MITCHELL COMPANY, or NEW JERSEY.

GAS GENERATOR AND BURNER VAPOR-BURNING LAM P.

SPECIFCATION forming part or" Letters Iatent No. 657,127, datedSeptember 4, 1900. Application led April 5,1899. Renewed July 20, 1900.Serial No. 24,333. (No model.)

To all whom it may concern.-

Be it known that IVILLIS MITCHELL',a citizen of the UnitedStates,residing at Malden,in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inVapor-Burning Lamps; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesaine.

This invention relates chieti y to lamps using gasolene or similar vaporand having a chamber which supplies the burner and a generating tubularcoil that discharges into the same.

The said invention consists in the construction and combination of partshereinafter more particularly set forth and claimed.

In the accompanying drawings, Figure l represents a vertical centralsection of a lamp embodying my invention. Fig. 2 represents inperspective the alcohol cup or bowl ofthe said lamp and some ofthe partsimmediately attached thereto or in contact therewith. Fig. 3 representsa detail view of the cover for this cup or bowl. Fig. d represents adetail view ofthe mixing-chamber. Figs. 5 and 6 represent detail viewsof the base of the said chamber. Figs.7 and 8 represent detail views ofsuccessive outer shells. Eig. 9 represents a detail perspective view ofthe rack which carries the regulator-needle and the guides for saidrack. Fig. 10 represents a detail view of the deflector arranged withinthe burnerscreen, and Fig. ll represents a detail view of the saidscreen withv the detlector in place.

A designates a broad hollow base, prefererablyof sheet met-al or cast 1netal, which may be either rectangular or circular in shape and servesalso as a gasolene-reservoir- This is filled through an oil-inlet A',into which is fitted thetubular stein of a cup or low funnel A2. Saidstem is internally threaded to receive the correspondingly-threadedsolid stem a of a stopper a, the top of which closes the top of the cup.The upper part of this base or reservoir A is formed into a hollow domeA3, which is provided with an air-inlet tube o3,

internally screw-threaded to receive the cor respondngly-screwthreadedstem a5 of an airvent plug ai, having'an airpassage a through it. Thispassage is turned laterally at its lower end through the side of thesaid stem, so that air may pass through the said plug to the interior ofthe said dome and base while the said plug is in the position shown inFig. l; but the inlet will be closed when the solid lower end of thestem a5 is turned down against the lower part of the tube as, which isso formed as to leave an opening much smaller than the main bore of thesaid tube. The outer part of the said plug is adapted to receive arubber bulb, by the compression ot' which air is driven into thereservoirA, 'forcing the gasolene up through a vertical tube WV, whichisslotted at its lower end and arranged within a vertical tube B. Acylindrical coupling-block C has a small central bore c in its middlepart and a recess C' in its lower end, into which the upper end ot thetube B is fitted. In the upper end of the said coupling-block isanother-recess C2 of about the same length as C', but of slightlygreaterdiameter, as shown. The wall oi' this is internally screw-threaded toreceive the correspondingly-threaded stem D of an alcohol cup or bowl D.The lower end of the said recess is conical to receive asimilarly-shaped iilling-block E. These parts D and E have a coincidentcentral vertical bore practically continuous with that of thecoupling-block C, so that a gasolene-tube F, about one-sixteenth of aninch in diameter, is carried up through the said coupling-block and stemand above the oil in the said cup or bowl D to forni a doublegenerating-coil G about the miXing-chamberI-I. Atubularcolumn I,concentric with tube C, extends up from the dome A3 to the alcohol-cupD, being rigidly secured at both ends. This column fits the exterior ofconplingblock C and also at its lower end on a cylindrical socket orbushing A4 of the dome A3, which is interposed between the lower end ofthe said column and the corresponding part of tube B and braces both,making a strong stem for the lamp. A concave cover I3, provided with acylindrical the rods J of an ordinary shade-frame surrounding thedome-shaped reticulated burner K of the lamp. This burner, preferably offinely-woven wire, is mounted on the top plate H' of the cylindricalmixing-chamber` H, before mentioned, said'plate being circumferentiallyenlarged to receive it. A cylindrical shell or jacket H2, of diameterslightly greater than that of the top plate, extends down from the saidtop plate to the cover l3 and is fastened by screws 7c to thecylindrical upward extension 1/ of the said cover, these part-s l and H2being arranged concentrieally. The peripheral part of the said top platerests on the upward extension I', and the upper edge of the jacket H2 isbent over at 7c on t-he peripheral part of the said burner above thesaid top plate to hold the said burner in place. The said top plate hasa central outlet HS formed therein and extended upward in the form of ashort tube, discharging the contents of the mixing-chamber into a cap ordeflector L, preferably-of sheet metal, suspended rigidly over the saidtube from the under side of the raised center of the said dome-formburner.. This detlector or cap allows the air and vapor to mix morethoroughly before escaping, then directs them downward and laterally, sothat they pass out at its periphery, and at last escape through the manysmall holes in the said burner for ignition. The base M of the saidmixing-chamber consist-s of an upper disk-shaped part having a series ofinlet-holes m formed through it, which admit the air from below to theinterior of the mixing-chamber, and a screw-threaded stem N, having acentral inlet-bore n, extended through the center of the said disk andreceiving from a nozzle or end h2 of the generator-coil a supply ofgasolene-Vapor, which passes from the said bore into the `saidmixing-chamber. This supply is governed by a needle-valve O working upthrough the said bore to close or open the said nozzle at will, saidvalve being carried by a rack P, which is engaged by a pinion Q on atransverse regulating-shaft R, mounted on the ltop of the saidalcohol-cup and provided with an exterior knob or milled head forconvenience of operation. Said rack moves up and down in guideways S,fastened rigidly by arms T to the said alcohol-cup.

The alcohol is supplied by a supplementary reservoir U in the mainreservoir or base A through an alcohol-pipe V, which extends upwardthrough the bushing A4 and couplingblock C aforesaid and follows Vthecurvature of the exterior of the alcohol cup or bowl D, its upper bentend o passing in through the Side of'said bowl D to the interiorthereof, as shown. The tubes and the several parts to leighteen inchesto be reliably operative. The

which theyare attached are preferably soldered toget-her.

To force out the alcohol at will, I preferably employ a piston X,operated by a rod Y, the said rod having a limited independent movementin a tubular stem Qof the said piston, such movement being limited by astoppin y. The said stem is provided with a hole at the side whichadmits alcohol to the bore of the said stem, and thereby tothe spacebelow the said piston when the said rod is raised, but is closed by thedownward motion of the rod. The piston moves up with the rod af ter thesaid hole is uncovered and down with the rod after the said hole isclosed, the alcohol being forced thereby out through the tube V, whichmakes connection with the bottom of the alcohol-reservoir.

l The needle-valve O passes through a stuffing box or gland Z, which isscrew-threaded internally to engage the external screwthreads of thestern N and provided with suitable pack-in g that surrounds the saidneedle-valve, being forced into the concavit-y n at the end of the saidstem on screwing up the said gland.

An external cylinder or casing Z', slightly\ flaring at the top andbottoni, surrounds the casing, shell, or jacket H2, leaving an airspacebetween them to prevent overheating the outer casing vor cylinder Z',which there is often occasion to touch. The small diameter of thegeneratortube is found exceedinglyeficacious. I can increase or diminishthe amount of pressure by varying the length of the said generator. Thisis usually about thirty inches and should not be as short as diametermust not be varied more than one thirty-second part of an inch or theresult may not be satisfactory.

The opera-tion is as follows: The base A being supplied with gasoleneand the supplemental alcohol-reservoir with alcohol, the latter isforced, as described, up through the pipe V to the cup or bowl D: Thealcohol is then ignited, heating the generator. After it has beenburning for about thirty seconds the needle-valve O is wi'thdrawn,allowing the heated air in the coil to escape into the mixing-chamber,and thus admitting the gasolen-e to the generating-coil, and the vaporthus produced is discharged into the mixingchamber through the passagebefore described. It there becomes mixedwith the air enter-ing throughholes m. The heated mixture of gasolene-vapor and air passes up throughthe burner, being more thoroughly commingled in and by the defiector onthe way, and is ignited as it issues through the said burner.Thisereates a draft up through the generator and mixing-chamber,continuously supplying the said burner until the needie-valve is raisedto eut off the supply of gasolene. Y

A mantle-supporting rod J2 passes through a guiding-perforation in oneof the legs or ICO IIO

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' rounding the said chamber and brackets I2 and is set at its lower endinto or through the support T. An adj Listing-screw J3, working throughthe side of cup D, bears against the said rod or support J2 and affordsa convenient means of holding the mantle at any point, within certainlimits, to which it may be adjusted vertically. This rod, if desired,may bc extended through the said cup, its joint therewith being madeliquid-tight, as must also be done with that of screw J3.

Having thus fully described myinvention, what I claim as new, and desireto secure by Letters Patent, is-

l. In combination with a mixing-chamber having inlets for air and vaporand an outlet for the same when mixed, a generator surrounding the saidchamber and supplying it through one of the said inlets, an alcohol-cupbelow the said chamber, a cover for the said cup provided with a centralcylindrical hollow upward extension surrounding the said generator, anda Wiregauze or perforated burner covering the top of the said chamber,substantially as set fortl 2. In combination with a mixing-chamberhaving inlets for air and vapor and an outlet for the same when mixed, agenerator sursupplying it through one of the said inlets, an alcohol-cupbelow the said chamber, a cover for the said cup provided with acentral, cylindrical, hollow, upward extension surrounding the saidgenerator, a wire-gauze or perforated burner covering the top of thesaid chamber and fastened on the same, and a deflector suspended fromthe said burner over the outlet of the said mixingchamber, substantiallyas set forth.

3. In combination with a mixing-chamber having inlets for air and vaporand an outlet for the same when mixed, a generator consisting of a line,tubular wire coil about onesixteentli of an inch in diameter woundaround the said mixing-chamber and discharging into the same, analcohol-cup below the said mixing-chamber and generator, and a cover forthe said cup having a cylindrical upward extension surrounding the saidgenerator and closed at its upward end by a horizontal annular extensionof the top of the said mixing-chamber, substantially as set forth.

4. In combination with a mixing-chamber having inlets for air and vaporand an outlet for the same when mixed, a generator surrounding the saidchamber and supplying it through one of the said inlets, a cup adaptedto receive alcohol and arranged below the said chamber to heat the saidgenerator when the liquid contained in said cup is ignited, a

burner supplied by the said chamber, a cover for the said cup providedwith a central cylindrical hollow upward extension external to the saidgenerator, means for supplying liquid to the said cup and the saidgenerator, and two concentric casin gs arranged outside of the saidcylindrical extension, each having an interval between it and the partnext within, substantially as set forth.

5. In combination with a mixing-chamber for air and vapor, having anopening for the admission of air, a base for the said chamber having asmall, central bore and a branch passage therefrom, a generating-coilwhich is wound about the said chamber and has its discharging end fittedinto the said branch passage, a needle-valve working up and down in thesaid bore, means for supplying gasolene to the said generator, mechanismfor raising and lowering the said needle-valve, guideways for the saidvalve and an alcoholcup provided with supports for the saidmixing-chamber and the said guideways, substantially as set forth.

6. In combination with a mixing-chamber, a burner supplied thereby and agenerator supplying vapor to the said chamber, an alcohol-cup arrangedto heat the said generator and cause it to supply the said chamber withvapor, a cover for said cup, feet or brackets for said cover which arenotched or recessed to fit on the edge of the said cup and adapted tosupport a shade-frame and means for supplying liquid to the said cup andgenerator, substantially as set forth.

7. In combination with a mixing-chamber, burner and generator arrangedsubstantially as described, an alcohol-cup arranged below them to heatthe generator and supply the chamber, and provided with adownwardlyextending stein having a central bore, a recessed and boredcoupling-block screwing on the said stem, a tube fitting into the lowerend of the said coupling-block, a tubular column supporting the saidcup, arranged concentric With the said tube and exterior to the saidcoupling-block, a base having a raised tubular part which iits betweenthe said column and the said tube, and conduits for the alcohol and theliquid which supplies the generator, extending up within the saidcolumn, substantially as set forth.

In testimony whereof I afix my signature in presence of two witnesses.

VILLIS MITCHELL.

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